Secondary burr
Secondary burr refers to material build-up or displacement at workpiece edges that can occur during subsequent machining processes.
The cause is often plastic material deformation or uncontrolled tool intervention.
Formation of secondary burr
Secondary burrs do not form directly during the cutting process, but rather during mechanical post-processing steps. Tool engagement, material displacement, and unsuitable process parameters can cause material to be raised or shifted at the edge.
Typical causes
- excessive contact pressure
- unsuitable tool design
- unstable tool engagement
- plastic material displacement
- unsuitable process parameters
Effects on edge quality
Secondary burrs affect edge quality and can impair stable subsequent processes. Especially when high demands are placed on coating ability, feel, or defined edge conditions, material protrusions negatively impact component quality.
Possible effects
- uneven edge profiles
- unstable coating conditions
- impairment of component haptics
- increased post-processing effort
- fluctuations in edge condition
Secondary burr in post-processing processes
Secondary burrs can occur in various mechanical post-processing operations. The risk of material build-up at the edge increases particularly with uneven material removal or unsuitable tool guidance.
The goal of edge processing is a reproducible, radius-like transition between surface and edge without uncontrolled material displacement.
Difference between primary burr and secondary burr
Primary burrs form directly during the cutting process. Secondary burrs, on the other hand, only form in subsequent processing steps due to material displacement and mechanical action on the edge.
Technical differences
- Primary burr: occurs immediately upon separation
- Secondary burr: arises in subsequent processes
- Primary burr: often sharp-edged material protrusion
- Secondary burr: frequent material dumping near the surface
FAQ
Why does secondary burr form?
Secondary burrs are caused by plastic material displacement and uncontrolled tool engagement during mechanical post-processing.
How can secondary burrs be reduced?
The risk of secondary burrs can be reduced through stable process parameters, controlled material removal, and suitable tool design.